D'Addario Helicore Cello StringsA string with optimal pliability and a clear warm tone, the Helicore by D'Addario is made with a multi stranded steel core. This very versatile string is the ideal string for any playing style. The E string is a high carbon, tin plated, plain steel string that has no winding. All D'Addario strings are manufactured, designed, and engineered in the USA to some of the highest quality control standards in the industry. NEED TO ORDER A LARGER OR SMALLER